On Episode 170 of This Week In Space, Rod Pyle and Tariq Malik are joined by Dr. Robert O'Brien to discuss powering spacecraft by radioisotope thermoelectric generators (RTGs).
Next time you're drinking a frosty iced beverage, think about the structure of the frozen chunks chilling it down. Here on Earth, we generally see ice in many forms: cubes, sleet, snow, icicles, slabs covering lakes and rivers, and glaciers. Water ice does this thanks to its hexagonal crystal lattice. That makes it less dense than nonfrozen water, which allows it to float in a drink, in a lake, and on the ocean.
